Race-winning World Superbike rookie Marco Melandri set the pace for the soon-to-be-disbanded factory Yamaha team, during day one of testing at Misano on Tuesday.
The Italian, whose 2012 plans are yet to be confirmed, was the fastest of the 13 WSBK riders present with a best lap time of 1min 36.0sec.
That is 0.344sec under the official race lap record set by Max Biaggi (Aprilia) in this year's restarted second race.
Melandri's Tuesday time was 0.3sec quicker than title leader Carlos Checa (Althea Ducati) who holds a 74 point lead over the Italian with three rounds to go.
Melandri's team-mate Eugene Laverty matched Checa's time for third, with recent first-time race winner Tom Sykes continuing his form with fourth for Kawasaki (+0.5sec).
The Englishman was followed on the timesheets by BMW Italia's Ayrton Badovini (+0.8sec), Castrol Honda's Jonathan Rea (+0.9sec) and Kawasaki's Joan Lascorz (+0.9sec).
Then came test riders Alex Hofmann (+1.0sec) and Steve Martin (+1.9sec) with the healing Ruben Xaus completing the top ten for Ten Kate (+2sec).
MotoGP race winner Toni Elias finished his first day on the BMW Italia machine in eleventh place (+2.1sec, see separate story), with Kawasaki's Chris Vermeulen (+2.4sec) and Honda's Makoto Tamada (+3.8sec) completing the order.
Pirelli has brought some of its 2012 tyres to the test, which concludes on Wednesday evening.